I am mechanically inclined and have worked as an engineer aboard navy ships; however, I am not a mechanic. After watching your video, I realize that there will be a significant amount of work to change out the injector cups. There also can be areas where overlooking small things can result in big, unexpected problems. With all that in mind, I'm going to take my time and methodically go through the steps you outlined. So, here goes. I'll let you know how it comes out.
It was a challenge for sure, not enough room to swing. For the rear cups I switched to a metal hammer since you can’t hit it very hard. I was still able to hear and feel it bottom out. Good luck!
When you first started cranking did it sound heavy or slow im cranking mine but it seems like its got weak ass battery i checked my batterys and both are in good condition with 100% charge